Worked on the shaka-project/shaka-player repository to enhance language reporting for media tracks, delivering a feature that exposes audio and video language information directly on track objects. Leveraged JavaScript and API design skills to update both external type definitions and internal stream utilities, ensuring language fields are accurately populated from manifest data and HTML5 source paths. Developed comprehensive unit tests to validate correct language reporting across a variety of stream configurations, focusing on robust media streaming scenarios. This work improved the clarity and accessibility of language metadata for developers integrating Shaka Player, while maintaining strong test coverage and type safety throughout.